Chuck



n AprillO, 1934. w. sPETz 1,954,759

CHUCK Filed Deo. 8, 1930 2 Sheets-Sheet l Fly. 1.

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W. SPETZ April 1o, 193.4.`

CHUCK Filed Dec, 8, 1930 2 Sheets-Sheet 2 anni? .30 ity with high efliciency and extremely low cost. air in each of said four groups.

Patented pr. 10, 1934 Y i I IUNITED vSTATES PATENT OFFICE CHUCK Y Y Wilhelm Spetz, Duisburg-Meiderich, Germany Application December 8, 1930, Serial No. 500,824 In Germany May 23, 1927 6 Claims. `(Cl. E30-59) In milling and planing machines for milling or Figure 1 shows in plan a table-shaped chuck planing plates, such as hook plates, ribbed plates forl simultaneous milling of ribbed plates disand the like, which are used for securing rails, it is posed in four adjacent rows. already known to use chucks the xed jaws of Figure 2 is a longitudinal section taken on the which are constituted by claw-like projections line A-A of Figure l. @a of the milling table shaped to correspond to the Figure 3 is a transverse section taken on the surface, important to the maintenance of the line B-B of Figure 1. measurements, of the side of the plates to be Figure 4 Shows in perspective the embodiment treated, while the movable jaws of thechuck shown inFigures 1 3.

' support the back of the plates and are so dis- Figure 5 illustrates a double sided rotatable posed that they grip the plate at the back and chuck for use in connection with hook plates. press the side being treated against said claw- Figure 6 is a transverse section taken on the like projections. line C-C of Figure 5.

The invention consists in equipping the table In Figures 1 to 4 of the drawings, a denotes the of a chuck of this type with'several groups of table-shaped chuck, the continuous longtiudinal 70 claw-like projections, arranged in rows and with ribs b of which are providedv with discontinuous iiuid pressure actuators acting simultaneously in Claw-Shaped projections or hOOk-J'eWS C- e are each of said groups underneath a plate so as to cylindrical holes in the chuck a, into which lit press the surface to be treated of said `plate pistons (not shown) operated by compressed air against the claw-like projections without the and by means of which the plates which are to be necessity of adjusting the plates. This has the treated are pressed from below against the projecadvantage that when there is a considerable detions c. The height f is such that the plates can mand for plates a large number of plates can be be introduced obliquely in the intervals between chucked and worked simultaneously, several the projections c at three intermediate points of planing tools, such as milling cutters for example, the chuck in each of the four rows. The two cor- S0 being operable side by side, simultaneously, or responding compressed air pistons in each row are the chuck may be so designed that the milling put in 'communication with each other, so as to cutters operate as the different rows of plates form a separate group, by means of passages g. move to and fro soas to combine maximum utild are the four inlet openings for the compressed The chuck according to the invention may also In Figures 5 and 6, a denotes the rotary chuck advantageously be so designed that, vvhileY one which can be rotated about the shaft l; it is proor more groups of plates are being treated, other vided on each side with 8 holese into which work groups of finished plates can be removed from pistons lc operated by compressed air. The comthe chuck and replaced by fresh plates so that pressed air for operating the pistons lc is supplied 99 thus the plates can be treated in uninterrupted through the passages y simultaneously to the S succession. pistons on each side of the chuck, i. e. separately For rotary milling machines which are proon each side. On both lateral edges of the chuck, vided with gripping members on each side and in screws n hold two U-shaped brackets o, both ends A40', which the milling cutters cut on the forward of each of which are provided with claw-like pro- 95` and return stroke, the chuck may, according to jecting hook-jaws c1. The projections c1 of one of the invention be so constructed that the clawsaid brackets o are provided with grooves c into like projections for one end of the plates are which t-the rib of the plate which has to be formed in pairs at the opposite ends of a U' milled. r denotes the hook plate in which the shaped bracket which is detachably connected groove his to be milled. 100

to one side of the chuck itself, while a similar The device operates as follows: bracket is detachably secured to the opposite The ribbed platesrare pressed on one side of the side of the Chuck for the other end of the plates. chuck a against the projections o1 by the pistons This arrangement provides very satisfactory and 7C and '511115 Chuked- During the milling 0f the A simple construction of the chuck andalso ready gIOOVB 0n that Side 0f the Chuck, h the ribbed 105 accessibility to the supporting devices combined plates which have previously been milled may be with easy interchangeability of the parts. replaced upon the opposite side by fresh plates. Two embodiments of the chuck according toV After the plates have been milled on one side, the the invention are illustrated in the accompanyapparatus is rotated about the shaft l through an 55 ing drawings. angle of 180 after which the plates can be treated 110 on the opposite side of the chuck. The milling rotary cutter must have a radius equal to the length s, so that it can be used on the forward and return stroke for milling the grooves h in their two possible positions.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

l. A chuck for clamping special work pieces, comprising in combination, a supporting body having a plurality of pairs of spaced and rigid hooked jaws which are disposed parallel with one of the greater dimensions of said body, and which jaws in each pair extend mutually toward each other and are adapted to hook over and hold the side edges of the work pieces, a plurality of projectible clamping devices disposed in said supporting body independently of the hooked jaws and arranged in at least two distinct groups and adapted to be projected a limited distance from said body perpendicularly to said one dimension thereof and directly against the bottoms of the work pieces in order to clamp the latter while resting upon said clamping devices between the outer ends of said devices and the under portions of said `jaws, and means eiective to simultaneously actuate the clamping devices in each group independently of the rest so that one or more workpieces may be clamped in one group while workpieces in another group are released.

2. A chuck for clamping special work pieces, comprising in combination, a supporting body having a plurality of pairs of spaced and rigid hooked jaws which are disposed parallel with one of the greater dimensions of said body, and which jaws in each pair extend mutually toward each other and are adapted to hook over and hold the side edges of the work pieces, there being a plurality of cylindrical bores extending directly into said body beneath said work pieces, reciprocable pistons individually working in said cylindrical bores independently of said hooked jaws and adapted to be projected a limited distance from said body perpendicularly to said one dimension thereof and directly against the bottoms of the work pieces in order to clamp the latter while resting upon said pistons between the outer ends of the pistons and the under portions of said pairs of jaws, which pistons are arranged in parallel rows subdivided into at least two independent groups, distinct intercommunicating means in said supporting body independently interconnecting the cylindrical bores in each group and adapted to receive compressed air and distribute the same within the group so that the pistons in each group may be simultaneously actuated independently of the rest in order that one or more work pieces may be clamped in said group while work pieces in another group are released.

3. A chuck for clamping special work pieces, comprising in combination, a supporting body in the form of a single sided bed plate having a plurality of pairs of spaced and hooked jaws rigid with said bed plate and both disposed parallel with one of the greater dimensions of said bed plate and arranged in generally the same plane, and which jaws in each pair extend mutually toward each other and are adapted to hook over and hold the side edges of the work pieces, a plurality of reciprocable pistons extending independently of said hooked jaws into said bed plate beneath said work pieces and adapted to be projected a limited distance from said bed plate perpendicularly to said one dimension thereof and directly against the bottoms of the work pieces in order to clamp the latter while resting upon said pistons between the outer ends of the pistons and the under portions of said jaws, which pistons are arranged in parallel rows subdivided into at least two independent groups, distinct intercommunicating means in said bed plate adapted' to cause simultaneous actuation of all of the pistons in each group independently of the rest in order that one or more work pieces may be clamped in said bed plate as a group while one or more'work pieces in another group are released.

4. A chuck for clamping special work pieces, comprising in combination, a rotary supporting body having two working sides which are each bounded along their longitudinal edges by detachable hooked retaining jaws which upon each working side extend mutually toward each other and are adapted to hook over and hold the side edges of the work pieces, a plurality of parallel rows of parallel pistons disposed underneath the bottoms of said work pieces upon each working side of said body and extending independently of said hooked jaws directly into each of said working sides transversely to the latter and the longitudinal axis of the body, which pistons are divided into at least two distinct and independent groups, and passages in said supporting body for distributing compressed air independently to each group in order to actuate the pistons therein and thereby clamp one or more work pieces exteriorly to said pistons beneath the under portions of the respectively adjacent hooked jaws in the group while other work pieces arel relased from beneath another group of hooked jaws.

5. Chuck for clamping special work pieces comprising a double-sided rotary body into each side of which are provided a plurality of parallel cylinders, two longitudinal U-shaped brackets detachably secured on the opposite edges of said body and provided with claw-shaped projections constituting the xed hook-jaws of the chuck and arranged in opposed parallel rows, a plurality of pistons working in said cylinders directly underneath said work pieces so as to constitute the movable jaws of the chuck and arranged in two groups, and pressure means for actuating the pistons belonging .to each of said groups respectively whereby to clamp said work pieces beneath said hook-jaws and expose between said jaws portions of the work pieces upon which work is to be done. 6. A chuck for clamping special work pieces, comprising in combination, a supporting body having a plurality of rigid hooked jaws forming corresponding pairs in which the individual jaws extend toward each other and are adapted to hook over the work pieces, a plurality of projectible clamping devices disposed in said supporting body independently of the hooked jaws and both arranged in at least two distinct groups and adapted to be projected outwardly against the bottoms of work pieces in order to clamp the latter between the outer extremities of said clamping devices and the inner sides of said hooked jaws so as to produce in each pair of hooked jaws and a corresponding clamping device a three-point clamping eiTect upon the work pieces involved, and means eiective to actuate the clamping devices in each group independently of the rest so that one or more work pieces may be clamped in one group while work pieces in another group are released.

WILHELM SPETZ. 

